[MacPorts] #64660: inkscape: build failure due to "no template named 'optional' in namespace 'std'"

[MacPorts]

#64660: inkscape: build failure due to "no template named 'optional' in namespace
'std'"
-------------------------------+----------------------
  Reporter:  dyne2meter        |      Owner:  mascguy
      Type:  defect            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.7.1
Resolution:                    |   Keywords:
      Port:  inkscape poppler  |
-------------------------------+----------------------

Comment (by mascguy):

 @dbevans, if you'd be interested in getting this updated and working, I'd
 appreciate it.

 I've taken on a boatload of GNOME/GIMP-related components in your absence,
 enough so that my backlog has gotten completely overwhelming.

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Ticket URL: <https://trac.macports.org/ticket/64660#comment:8>
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